Underfeed stoker



July 31 1923. 1,463,337

R. S. RILEY UNDERFEED STOKER Filed Apg. 4, 1919 5 Sheets-Sheet 1 Invenm:

July 31, 1923.

R. 5. RILEY UNDERFEED STOKER Filed Aug. 4, 1919 5 Sheets-Sheet 2 July 31, 1923.

R. s. RlLE-Y UNDERFEED STOKER Filed Aug. 4, 1919 5 Sheets-Sheet 3 IIIIIIIIIIII July 31, 1 923.

R. S. RILEY UNDERFEED S TOKER Filed g- 1919 5 Sheets-Sheet 4 H WHHHHHHHHH;

fnvenz ov R .5 Riley WHHHHHHHWW R. s. RILEY UNDERFEED STOKER Filed Aug. 4, 1919 r atented July 31, 1923.

' BOBEB/I' samonn RILEY, or woncnsrnn, mnssaonusnrrs, ASSIGNOR To sam'oan ma s roxnn co, or woacas'rna, messaonusnrrs, A coaroaa'rron'or mas- SACHUSETTS.

UNDERFEED STOKER.

Application filed August 4, 1919. Serial No. 315,166.

I To wlwm it concern: I

-Be it known that I, ROBERT SANFORD (RILEY, a citizen of the United States, re-

siding at Worcester, in the county of Worcester and State of Massachusetts, have invent ed a new and'useful Underfeed Stoker, of

. which the following is a specification.

Th s invention relates to a -stoker' of the underfeed type, and particularly to 1mproved devices for distributing the fuel laterally over the ,fue'l bed. 5 1

It is the general object of my inventlon to provide an improved stoker of the type in whichlateral retorts receive fuel from the usual longitudinal retort, and in Wl'llCll special provision is made for reciprocating such retorts or portions thereof to assist the lateral feed.

In the preferred form of my invention I provide means by which the different parts of each lateral retort'maybe laterallj reciprocated in opposite directions, U

My invention further relates to arrangements and combinations of parts to be here.-

inafter described .and more particularly pointed out in the appended claims.

A preferred form of my invention is shown in the drawings in which Fig. 1 is a plan view of my improved stoker;

Fig. 2 is a longitudinal sectional elevation thereof, taken alongv the line 2-2 in F g. 1;

Fig. 3 is a partialfront elevation;

Fig.- 4 is'a partial transverse sectional elevation, taken along the line 1-4 in Fig. 1;

Figs. 5 and 6-are detail sectional elevations taken along the lines 5---5 and 6-6 1n Fig. 1; Fig. 7 is a transverse sectional elevation,

showing a different arrangement of the driving mechanism, and

Figs. Sand 9 are views similar to Figs. 1'.

and 2 showing an additional modification in modeof operation.

an underfeed stoker i'n which coal or other fuel is fed from a hopper 10 to a longitudinal retort ll bya reciprocating plunger or ,ram 12. The longitudinal 'retort 11 communicates with a plurality of lateral or branch retorts 13, in which the'greater part of the actual combustion occur Each lateral retort is commonly provided withan outer overfeed grate section 13 and with a dumping or discharge plate 14 by the J side Walls.

which the refuse is ejected, to fall into usual ash-pit. Each lateral retort 13 is oreferably formed in two sections, the retort bethe plunger ,12. Lugs or projections 17 15 assist in moving the formedon the plate coal rearwardly along the retort 11.

The plate 15 is supported on cross frame members18 and is guided by angle lates 19 secured to said frame members. over strips 26 prevent the escape of coal along the an additional cove'rplate21 (F1g.-2) prevents the accumulation sides of the plate. 15 and of coal at the rear end of the plate 15. Each half section of a lateral retort 13 may be formed as a single casting 22;upon which side grate blocks overfeed grates 13 are mounted: An additional inner gratemember 24;may' be. also secured thereto, which member forms the upper part of a side wall of the longitudinal retort and also the upper'part of a; side wall of the lateral retort. F;

The dumping plates 14 are formed in short sections corresponding .tothelateral .retort sections and are pivotallyconnected thereto at 25. These dumpin plates are supported. at'their lower ends E 26 which may be manuallymoved in or out rack bars. The rate of discharge of" the dumping plates is determined largely by the eferring to the drawings I have shown;

which may be integral with the frame mem here 18 previously described. These sup-,

ports 28 are shown in the drawings as r'est-. ing upon rigid I-beams 29."

" 'It 's customary in underfeed stokers. to supply air under pressure to the chamber heneath the retort, from which the. airpasses upwardly through openings in-theretort' 23 and also the outer rack bars:

side walls, thus increasing the combustion and cooling the walls. It is sometimes desirable to supply air atalower pressure to the overfeed grates 23 and 13 and for this purpose I provide each retort casting 22 with an intermediate partition connecting through openings 31 and 32 with a chamber 33. The admission of air from the main air chamber to the chambers 33 is controlled by dampers 34 which may be manually adjusted.

The mechanism for longitudinally reciprocating the plunger 12 and retort bottom 15 and for laterally reciprocating the side retort sections may be of any suitable type, and as shown herein comprises a cylinder 35' within which is mounted a piston 36 connected to a piston rod 37 supported in bearings at the front of the Stoker. A bell crank 38 has its forked end 39 receivedbetween collars 40 and 41 on the piston rod 37, and has its opposite end 42gconnec-ted by a link 43 to the plunger 12. Reciprocation of the piston rod 37 is efiective through the connections described to reciprocate the plunger 12. Obviously the rod 37 maybe extended to operate a series of stokers and may 'be reciprocated'by mechanical devices 7 if preferred.

A'lever 44 (Fig. 3) is mounted on a fixed pivot 45 and has its upper forked end 46 positioned between collars 47 and 48 on the piston rod 37. The lower end of .the lever 44 is connected by a link 49 to an arm 50 dependingfrom a cam shaft 51 (Fig. 2) which in turn is provided with'a plurality of oppositely disposed. cams 52 and 53. The deagitated and the fuel is fed gradually over the outer grates 13 to the dumping plates 14 from which the refuse is discharged.

llnord'er to avoid having incomplete lateral retorts at the ends of the'stoker, T provide a plate 60 to fill inthe space between the top of the side wall of the first complete lateral retort and the .end wall of the furnace and if provide a similar plate for the opposite end of the furnace. These plates are commonly provided withdumping or discharge plates 14 and are preferably reciprocated laterally thesame as the retort sections. 4

y The operating mechanism above described provides for alternately reciprocating all adjacent retort sections, each section compristically than the long single incline of access? ing one. half of a lateral retort and one half of an adjacent side wall. 7 It is found desirable under certain conditions to reciprocate the two adjacent sections forming a retort wall together instead of alternately.

In Fig.7, l have shown a double cam til adapted to engage an upper bracket 62 se cured, for-instance, to the'retort section B,

and a lower bracket .63 secured to the section B. As the shaft 51 is oscillated, the sections B and B will alternately approach and recede from each other.

'By suitable selection and arrangement of the single cams 52 and 53, previously de scribed, and the double cams 61, any desired relative movement of the retort sections can be secured. By using double cams throughout,- each successive pair of retort sections may be caused to approach and recede and the successive Pairsmay each, move in difierent directions. By usin' single cams 52 or 53 andthe connections-s own in Fig. 4 for each alternate pair of retortsections and using do'uble camsfil with the connections shown in Fig. 7. for the remaining pairs of retort sections, the followin operation of the parts may be achieved, t e construction being shown in Figs. 8 and 9. The plate A. (Fig. 1) and the laterakretort sectionA' may be reciprocated as a unit bythe mechanism shown in Fig. 4, their inner faces being at a constant distance apart. The retort section B may be reciprocated simultaneously and in the same direction'as the pie. e A and the retort section B may at the same time be reciprocated in the opposite direction by the mechanism shown in Fig. 7 the parts B and B alternately approaching and receding from each other. Theretort sectionsjC and C may be moved in the same direction as the section B, these parts're- -maining at a constant distance apart and-leein actuated by the mechanism of Fig. 4.

With this arrangement, the plate A and section B moving together form in efi'ec-t a plunger,acting to push the fuel along the lateral retort formed by the sections A. and B. lln the same way, the sections B and C act together to feed fuel into .the lateral retort formed by the sections B and'C.

( It will .also be noted that the two sections forming each lateral retort or trough move in opposite directions to thoroughly agitate the fuel. 1

This arrangement vantages in respect to fuel distribution over the arrangement first described, in which 'ad- I jacent retort sections move in different rections slmultaneously.

Furnaces of this type are particularly adapted for use in places where the headroom or sp'acebeneath the boilers is limited. The relatively short inclines of the lateral overfeed grates require much less space verpossesses certain adthe ice

. and

retort, a plurality of lateral retorts com-' municating with said longitudinal retort each formed in a plurality of parts extending in the direction of the retort length, and means to move said lateral retort parts to assist lateral movement of the fuel.

2. An underfeed stoker comprising a longitudinal retort, means to feed coal to said retor t, a plurality, of lateral retorts com municating with said longitudinal retort, each lateral retort being separated into two parts in the direction of its length, and means to reciprocate adjacent parts of adjacent retorts simultaneously in opposite directions;

3. An underfeed stoker comprising a longitudinal retort, means to feed coal to said retort, a plurality of lateral retorts communicating with said longitudinal retort and each formed in two parts, and means to reciprocate the two parts of each lateralretort in opposite directions. I

4. An underfeed stoker comprising a longitudinal retortflneans to feed coal to said retort, a plurality of lateral retorts communicating with said longitudinal retort and each having separate retort side wall sections, and means to reciprocate adjacent side wall sections simultaneously in opposite directions.

5. An underfeed stoker comprising a longitudinal retort, means to feed coal'tosaid retort,- a plurality of lateral retorts communicating with said longitudinalretort and each divided into separate parts at the center of the bottom the'reof, adjacent lateral retorts having dividing walls separated at the middle of the top thereof to form independent side wall sections for said adjacent retorts, and means to reciprocate as a unit each of said side Wall sections and that part of a retort bottom associated therewith.

6. An underfeed stoker comprising a 1ongitudinal retort, means to feed coal to said retort, a plurality of lateral retorts communicating with said longitudinal retort and each divided into separate parts at the center of the bottom thereof, adjacent lateral retorts having dividing walls each separated at the middle of the top thereof to form independent side wall sections for to reciprosaid adjacent retorts, and means simultanecate the two parts of each retort ously in opposite directions.

' bination,

feed coalto said retort, a plurality of lateral- 7. An underfeed stoker having in coma longitudinal retort, means to retorts communicating with said longitudinal retort and formed-in parts, discharge plate sections. connected with said lateral retort parts, and means to reciprocate said lateral retort parts and associated discharge plate sections the fuel.

.8. An'underfeed stoker comprising alon gitudinal retort means to feed coal to said retort, a plurality of lateral retorts -comto assist lateral movement ofmunicating with said longitudinal retort and formed in parts, means to reciprocate adjacent lateral retort parts in opposite di-. rections,.and means to supply-air at different pressures lateral retorts.

9. An 'underfeed stoker having, in combination, a longitudinal retort, means to feed coal lateral reto communicating with said longitudinal retort and disposed on opposite sides thereof, each lateral retort being formed of two separate castings, laterally opposite castings being joined in pairs, and means to oppositely reciprocate adjacent palrs. Y

10. An underfeed stoker having, in combination, a longitudinal retort, means to feed coal to said retort, a plurality of lateral retorts communicating with said longitudi-v nal retorts and each formed in sections, said lateral retorts having raised dividing walls intervening between adjacent retorts, an outer longitudinally extended overfeed grate mounted on each lateral retort section, and means to reciprocate said lateral retort sections to assist lateral fuel feed.

to "saidlongitudinal and n to said retort, a plurality of nation, a longitudinal retort, means to feed coal to saidretort, a plurality of lateral retorts communicating with said longitudinal retort and each formed in sections, said lateral retorts having raised dividing walls intervening between adjacent. retorts, an overfeed grate and a discharge plate mounted at the outer end of each lateral retort section, and means to laterally reciprocate eachv lateral retort section and the parts associated therewith. l

12. An underfeed stoker having, in combination, a longitudinal retort. means to feed coal thereto, a plurality of lateral retorts communicating with said longitudinal retort and formed in parts, means to move the parts of said lateral retorts transversely of the stoker, a plate adjacent one of said lateral retorts, and means to move said plate laterally.

In testimony whereof I have hereunto aifixed my signature.

.Ronnnr SANFORD RILEY. 

